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Related Concept Videos

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors01:31

Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors

The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.
Diels–Alder Reaction: Characteristics of Dienophiles01:24

Diels–Alder Reaction: Characteristics of Dienophiles

In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction.
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends on...

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Related Experiment Video

Updated: Jul 14, 2026

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
07:02

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

Steering Diels-Alder Reaction with Mechanical Force: Structure Deformation versus Electron Rearrangement.

Weijie Huang1, Junchao Liao1, Xuan Wang1

  • 1School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.

The Journal of Physical Chemistry. A
|July 12, 2026
PubMed
Summary

Mechanochemistry uses force to control chemical reactions, offering a sustainable alternative. Applying force can lower reaction barriers by deforming molecules and rearranging electrons, providing insights into force-controlled synthesis.

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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

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Last Updated: Jul 14, 2026

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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Published on: August 25, 2016

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

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Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

Published on: July 28, 2020

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Mechanochemistry offers a sustainable alternative to traditional solvothermal methods.
  • The precise mechanism by which mechanical force influences chemical reactivity is not fully understood.
  • Understanding force-mediated reaction microenvironments (RME) is crucial for developing new synthetic strategies.

Purpose of the Study:

  • To investigate the mechanism of force-controlled Diels-Alder reactions using computational methods.
  • To elucidate how applied force affects molecular structure, electron distribution, and reaction barriers.
  • To provide fundamental insights into the role of mechanochemistry in chemical synthesis.

Main Methods:

  • Density functional theory (DFT) calculations were employed to model the Diels-Alder reaction.
  • Activation strain analysis was used to dissect the contributions of strain energy and electronic effects.
  • Detailed structural analysis examined molecular deformations and bond formation dynamics.

Main Results:

  • Applied force significantly modulates the reaction barrier, lowering it when directed towards the dienophile.
  • Force-induced molecular deformation and electronic rearrangement act synergistically to control reactivity.
  • The reaction mechanism shifts from synchronous to asynchronous under force, driven by asymmetric bond formation.
  • Force promotes unidirectional electron transfer from the diene to the dienophile.

Conclusions:

  • Mechanical force can be precisely tuned to control reaction pathways and kinetics.
  • The study reveals key molecular-level mechanisms governing force-controlled chemical transformations.
  • These findings pave the way for designing novel mechanochemical synthetic routes.